Permalinks with timestamp (3 posts)

I need to use a permalink with the following structurehttp://www.mysitename.com/%timestamp%
with 10 digit timestam that is equivalent to datetime in the form of yyyy-MM-dd hh:mm:ss. But unfortunately, i could not find permalink tag %timestamp%.

Thank you. But it is 14digits. What I need is an equivalent timestamp [the kind of output from the PHP function time()]. Could you please let me know how to do this? (aprroximately i need to perform [((((yyyy*365)+day)*24)*60)*60] to get that number